[PATCH 0/2] rust: usb: add initial USB abstractions

[Daniel Almeida <daniel.almeida@collabora.com>]

This adds initial support for USB Rust drivers, not only because I see a
widespread use of module_usb_driver() in media (which is a subsystem I
aim to support) but also because I want to learn about USB in general
and this is a nice opportunity to start doing so.

I tried to keep things as consistent with pci.rs and platform.rs as
possible and tested it by manually binding a device (i.e.: my Logitech
mouse) to the sample driver via:

/sys/bus/usb/drivers/rust_driver_usb/new_id

This initial patch is therefore comprised of the same patterns that are
known to work for pci and platform already.

Physically disconnecting the device also worked, i.e.: nothing bad
showed up in dmesg.

Note that I did not touch MAINTAINERS at all. The objective is to
kickstart the discussion of what to do there here in v1.

---
Daniel Almeida (2):
      rust: usb: add basic USB abstractions
      samples: rust: add a USB driver sample

 rust/bindings/bindings_helper.h |   1 +
 rust/helpers/helpers.c          |   1 +
 rust/helpers/usb.c              |   8 +
 rust/kernel/lib.rs              |   2 +
 rust/kernel/usb.rs              | 457 ++++++++++++++++++++++++++++++++++++++++
 samples/rust/Kconfig            |  11 +
 samples/rust/Makefile           |   1 +
 samples/rust/rust_driver_usb.rs |  47 +++++
 8 files changed, 528 insertions(+)
---
base-commit: 44d454fcffa8b08d6d66df132121c1d387fa85db
change-id: 20250825-b4-usb-dd0fe44fd78b

Best regards,
-- 
Daniel Almeida <daniel.almeida@collabora.com>